Nadal dumped out in Halle

World No 1 Rafael Nadal was sensationally dumped out of the Halle grasscourt tournament by Germany's world No 85 Dustin Brown 6-4 6-1 in less than an hour.

The recently-crowned nine-time French Open champion continued his struggles at the event, where he has yet to get past the quarter-finals.

Just days after winning a 14th Grand Slam on the red clay at Roland Garros, the 28-year-old Mallorca native saw his build-up for Wimbledon get off to the worst possible start against Brown, who has yet to win an ATP singles event.

Brown, the flamboyant and big hitting Jamaican-German, broke serve in the 10th game and did not look back.

In the opening five games of the second set, Nadal won just five points and, although he stopped the rot eventually, 85th-ranked Brown confidently served out the best win of his life.

"Difficult to talk about the match, I don't know what to say. I didn't play," said a downcast Nadal following his defeat.

"It can happen on this surface against such a opponent. This match has no value preparing for Wimbledon but the match was negative in all ways.

"Now, I'll leave to Mallorca but not sure I will play because I need to rest and then want to fly to Wimbledon Wednesday early morning," he continued.

Meanwhile, Roger Federer got his Wimbledon preparations fully underway, despite looking out of sorts. He still managed to edge out Portugal's Joao Sousa 6-7 (8/10) 6-4 6-2 in his second round clash.

Playing for the first time since losing to Ernests Gulbis in the last 16 of the French Open, the six-time former winner of the German tournament started brightly but was soon on the backfoot against the improving Sousa, who clinched the first set on a tie-break.

Federer looked frustrated at times, but the match turned on the seventh game of the second set when Sousa's level suddenly dipped allowing the Swiss great the opportunity to secure his first break.

From then on it was all Federer with a break of serve in the first game of the deciding set sending him safely on his way into the last eight.

"I struggled a bit on return during a set and half," said Federer. "Afterwards, it was better, more variation on second serve.

"It was slightly frustrating, but important to stay calm. Maybe I got more confidence winning this way than 6-4 6-4.

"When I came here (Saturday) to start practice it was so so, but now it's better. For me, it doesn't take a lot of time to get used to the grass."

Third seed Milos Raonic of Canada lost on Wednesday 6-4, 6-4 to German wildcard Peter Gojowczyk.

Federer's opponent in the quarter-finals will be Lu Yen-Hsun of Taiwan, who defeated big-serving Ivo Karlovic of Croatia 7-6 (7/2) 7-6 (7/3).

"I'll try to climb the mountain. Everybody thinks he's favorite. I will try my best and enjoy," Lu said of his chances.

"If I'm 150% and he's 100% I think I'd still lose. Maybe if he is in a bad day. Nothing worse than a 6-0, 6-0!

"I have a lot of respect for Federer, he's an overall tennis player, won everything. We learn from him watching his games."